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const fs = require('fs');
const input = fs.readFileSync('./day-2/input.txt').toString();
const lines = input.split('\n');
const [ROCK, PAPER, SCISSORS] = ['rock', 'paper', 'scissors'];
const [LOSS, WIN, DRAW] = ['loss', 'win', 'draw'];
const defeatMap = { // What defeats what
[ROCK]: SCISSORS,
[SCISSORS]: PAPER,
[PAPER]: ROCK,
}
const shapeMap = {
A: ROCK,
B: PAPER,
C: SCISSORS,
X: ROCK,
Y: PAPER,
Z: SCISSORS,
}
const shapeScores = {
[ROCK]: 1,
[PAPER]: 2,
[SCISSORS]: 3,
};
const outcomeScores = {
[LOSS]: 0,
[DRAW]: 3,
[WIN]: 6
};
const result = lines.reduce((acc, line) => {
const [opponentShape, shape] = line.split(' ').map(code => shapeMap[code]);
if (!shape || !opponentShape) return acc;
let outcome = LOSS;
if (shape === opponentShape) outcome = DRAW;
else if (defeatMap[shape] === opponentShape) outcome = WIN;
return acc + shapeScores[shape] + outcomeScores[outcome];
}, 0)
console.log(result);
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